\begin{table}[htbp]
\caption{National first names by ``match''}
\label{tab:selection}
\begin{center}
\begin{tabular}{p{4cm}p{2cm}p{2cm}p{1cm}p{2cm}p{1cm}p{1cm}}
\hline
Families & \multicolumn{3}{c}{...with child before and after} & \multicolumn{3}{c}{...with child before or after} \\
        & \multicolumn{3}{c}{(Match)} & \multicolumn{3}{c}{(No match)} \\
      & N & Before & After  & N & Before & After \\
\hline
Aachen     & 5385  & 6.00 & 15.22 & 4784 &  6.50 & 15.96        \\
Muenster     & 2450 & 12.14  & 18.80  &  2981  & 13.37  &  16.96         \\
\hline
Frankfurt   & 6076    & 13.55  & 14.37 & 6232 &  13.11 & 13.34          \\
Hanover     & 2633   & 19.24  & 22.42 & 4212  & 21.57 & 24.07          \\
Heidelberg  & 10331    & 6.28 & 7.22 & 6559  & 7.45 &  8.99            \\
Mannheim    & 2915    & 6.60 & 6.83 & 2226 &  6.10 & 6.91             \\
Nuremberg   & 3511    & 9.16 & 9.00  & 4248 & 7.56 &  9.64           \\
\hline
Berlin      & 13741  & 31.40 & 32.37 & 15572  & 30.52 & 30.61       \\
\hline
\end{tabular}
\end{center}
\emph{Notes:} Share of national first names in \% before and after treatment by city for observations with one child either before \emph{and} after treatment, i.e., a ``match'', and observations with at least one child before \emph{or} after treatment, i.e., ``no match''.
\end{table}
